diff --git a/platform/synthesis.sh b/platform/synthesis.sh
index b93968437..c28a47cdd 100755
--- a/platform/synthesis.sh
+++ b/platform/synthesis.sh
@@ -9,7 +9,7 @@ lockfile=$top/synthesis_building
 source=$top/eduke32
 output=/var/www/dukeworld.duke4.net/eduke32/synthesis
 make=( make -Bj4 SYNTHESIS=1 PLATFORM=WINDOWS CROSS='i686-w64-mingw32-' CC='i686-w64-mingw32-gcc' CXX='i686-w64-mingw32-g++' AS='nasm' PRETTY_OUTPUT=0 SDLCONFIG='' )
-make64=( make -Bj4 SYNTHESIS=1 PLATFORM=WINDOWS CROSS='x86_64-w64-mingw32-' CC='x86_64-w64-mingw32-gcc' CXX='x86_64-w64-mingw32-g++' AS='nasm' PRETTY_OUTPUT=0 SDLCONFIG='' )
+make64=( make -Bj4 SYNTHESIS=1 PLATFORM=WINDOWS CROSS='x86_64-w64-mingw32-' CC='x86_64-w64-mingw32-gcc' CXX='x86_64-w64-mingw32-g++' AS='yasm' PRETTY_OUTPUT=0 SDLCONFIG='' )
 clean=
 
 # the following file paths are relative to $source